WO2004106964A2 - Self calibration of signal strength location system - Google Patents
Self calibration of signal strength location system Download PDFInfo
- Publication number
- WO2004106964A2 WO2004106964A2 PCT/US2004/016161 US2004016161W WO2004106964A2 WO 2004106964 A2 WO2004106964 A2 WO 2004106964A2 US 2004016161 W US2004016161 W US 2004016161W WO 2004106964 A2 WO2004106964 A2 WO 2004106964A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- value
- range
- mobile unit
- received
- access point
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6803—General methods of protein analysis not limited to specific proteins or families of proteins
- G01N33/6842—Proteomic analysis of subsets of protein mixtures with reduced complexity, e.g. membrane proteins, phosphoproteins, organelle proteins
Definitions
- This invention relates to object location systems, and particularly to systems having a plurality of access points wherein mobile units communicate with the access points using a wireless data communications protocol, such as IEEE Standard 802.11.
- the invention particularly relates to systems wherein location of a mobile unit is determined by measuring the signal strength of mobile unit transmissions which are received by access points to estimate the range of a mobile unit from the access point.
- access point is intended to apply to access points as contemplated by Standard 802.11, or other standards, that interface a computer or a wired network to the wireless medium, and also RF Ports and cell controllers connected thereto, as described in co-pending application Serial No 09/528,697, filed March 17, 2000, the specification of which is incorporated herein by reference.
- a major variable in determination of range of a mobile unit from an access point is the signal strength of the mobile unit.
- NIC cards transmitter cards
- transmitter signal strength may vary over the life of a mobile unit and the life of its rechargeable battery.
- Differences in transmitter power for mobile units in a system can be calibrated out by doing a measurement of signal strength as received from a known distance and providing a correction factor that is identified with that particular mobile unit.
- Such calibration requires special calibration procedures for each mobile unit as it is put into service, and, unless units are recalibrated, cannot account for changes in transmitter power as the mobile unit or its battery ages.
- a method for calibrating an object location system wherein transmitting mobile units are located by measuring received signal strength of signals transmitted by the mobile units and received by access points distributed over an area.
- Data messages are sent from at least one of the access points to a mobile unit to be calibrated.
- Acknowledgement signals from the mobile unit in response to the data messages are received by the at least one access point.
- a first value of range of the mobile unit from the access point is determined on the basis of time delay between the data message transmission and the acknowledgement signal.
- a second value of range is determined by measuring the signal strength of the acknowledgement signals received by the access point from the mobile unit corrected by a correction value. The first value of range is used to update the correction value.
- the correction value is updated by determining the first value of range and the second value of range for a plurality of transmitted data messages and a plurality of received acknowledgement messages.
- a difference between the first value of range and the second value of range is determined for each of the plurality of data messages and plurality of received acknowledgement signals.
- the differences are averaged and the average of the differences is used to update the correction value.
- the plurality of data messages may be sent and the plurality of acknowledgement signals may be received by the same access point. Alternately, the plurality of data messages may be sent by more than one access point and the plurality of acknowledgement signals may be each received by an access point transmitting the corresponding message.
- the correction value may be updated by determining the first value of range and the second value of range for the transmitted data message and received acknowledgement message, determining a difference between the first value of range and the second value of range and updating the correction value using a selected fraction of the difference.
- Figure 1 is a simplified block diagram showing an exemplary system in which the method of the present invention may be practiced.
- Figure 2 is a flow diagram illustrating an embodiment of the method of the present invention.
- FIG. 1 there is schematically shown a wireless local area network system 10, which may for example follow the protocol of IEEE Standard 802.11.
- the system 10 of figure 1 includes a computer 12, which acts as a server, and is connected over a wired network to access points 14, 18 and 20 which are arranged at fixed locations within an area, such as a school, an industrial facility or a hospital.
- access points 14, 18 and 20 which are arranged at fixed locations within an area, such as a school, an industrial facility or a hospital.
- access points 14, 18 and 20 which are arranged at fixed locations within an area, such as a school, an industrial facility or a hospital.
- the system 10 provides a function of locating the mobile units within the area.
- location of a mobile unit is determined by receiving signals from the mobile unit at a plurality of access points and measuring the received signal strength, such as by the RSSI function of Standard 802.11 receivers.
- the system may be initially calibrated to form a database relating signal strength to location within the area, and the received signal strengths from a plurality, such as three or more access points 14, 18 and 20 are provided to server computer 12, which compares the signal strength to the database to derive a location within the area for mobile unit 16.
- the ranges Rl, R2 and R3 between mobile unit 16 and access points 14, 18, 20 may be determined by a range equation form the received signal power level.
- the calibration of system 10 or the use of a range equation assumes that all mobile units have identical transmitter power levels.
- the range equation assumes that range of a mobile unit can be determined by assuming that signal strength varies with the square of range.
- a correction value may be provided which is associated with each mobile unit that compensates for variations from nominal transmitter power for that mobile unit.
- the correction value may be applied to the received signal strength measurement or to the range determination as an addition, subtraction or multiplication factor according to the value to which the correction value is applied. For example, if the correction value is applied to a signal strength value in decibels, the correction would be a value in decibels added to or subtracted from the signal strength value.
- FIG. 2 there is shown an embodiment of the method of the invention wherein correction values associated with a mobile unit are updated on a continuous or periodic basis in dependence on the current transmission characteristics of the mobile unit.
- a first range between a mobile unit and one or more access points is determined using the round trip transmission time for signals between the access point and the mobile unit and a second range between the mobile unit and one or more access points is determined using received signal strength for transmissions from the mobile unit to the one or more access points applying the current correction value for the mobile unit. If the first range value and the second range value are the same, it is assumed the correction value is correct for that mobile unit. If the first range value and the second range value are different the correction value is updated using the measured range values assuming that the transmission time range value is correct. Updating the correction value will depend in precise calculation upon the values to which the correction values are applied.
- the correction value is signal strength in decibels, and the first range value indicates a range of 10 meters, and the second range value indicates a range of 20 meters, the correction value may require adjustment by 6 decibels, corresponding to a two-to-one range difference.
- a running correction may be used wherein the correction value is updated by only a selected value of the required update for each set of measurements, so that over a period of ime the correction value approaches the determined correction value and errors are averaged out. hi this approach measurements showing excessive differences between the range values may also be disregarded.
- the frequency at which updating of the correction values is implemented depends on the particular system and its operational requirements. Generally re-calibration should not be so frequent that it adds significant burden to the overall traffic of the system. Changes to mobile unit transmitter power are not likely to be rapid or frequent. Further the operation can be spread over a time period since the correction values for all mobile units need not be updated at the same time. Accordingly mobile units may be updated on a cyclic schedule over a period of one month, for example.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04753058A EP1683285A2 (de) | 2003-05-23 | 2004-05-24 | Selbstkalibration eines signalstärken-positionsbestimmungssystems |
JP2006533324A JP4374021B2 (ja) | 2003-05-23 | 2004-05-24 | 信号強度による位置探索システムの自己補正方法 |
CN200480012342XA CN1830163B (zh) | 2003-05-23 | 2004-05-24 | 校准目标定位系统的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US47309603P | 2003-05-23 | 2003-05-23 | |
US60/473,096 | 2003-05-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004106964A2 true WO2004106964A2 (en) | 2004-12-09 |
WO2004106964A3 WO2004106964A3 (en) | 2006-05-26 |
Family
ID=33490560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/016161 WO2004106964A2 (en) | 2003-05-23 | 2004-05-24 | Self calibration of signal strength location system |
Country Status (5)
Country | Link |
---|---|
US (1) | US7065325B2 (de) |
EP (1) | EP1683285A2 (de) |
JP (1) | JP4374021B2 (de) |
CN (1) | CN1830163B (de) |
WO (1) | WO2004106964A2 (de) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006101675A1 (en) * | 2005-03-15 | 2006-09-28 | Polaris Wireless, Inc. | Estimating the location of a wireless terminal based on calibrated signal-strength measurements |
JP2009515201A (ja) * | 2005-11-07 | 2009-04-09 | クゥアルコム・インコーポレイテッド | Wlan及び他の無線ネットワークの位置測定方法 |
JP2011107158A (ja) * | 2004-11-17 | 2011-06-02 | Qualcomm Inc | 位置決定におけるアンビギティーの解決方法 |
CN102577189A (zh) * | 2009-10-12 | 2012-07-11 | 摩托罗拉解决方案公司 | 用于确定无线系统中的节点的范围信息的方法和装置 |
US8483717B2 (en) | 2003-06-27 | 2013-07-09 | Qualcomm Incorporated | Local area network assisted positioning |
US9042917B2 (en) | 2005-11-07 | 2015-05-26 | Qualcomm Incorporated | Positioning for WLANS and other wireless networks |
US9778372B2 (en) | 2003-06-27 | 2017-10-03 | Qualcomm Incorporated | Wireless network hybrid positioning |
US10568062B2 (en) | 2006-11-04 | 2020-02-18 | Qualcomm Incorporated | Positioning for WLANs and other wireless networks |
Families Citing this family (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3649404B2 (ja) * | 2003-02-28 | 2005-05-18 | ソニー株式会社 | 測距・測位システム及び測距・測位方法、並びに無線通信装置 |
WO2004112354A2 (en) * | 2003-06-04 | 2004-12-23 | Symbol Technologies, Inc. | Method for mobile unit location estimate in a wireless lan |
US7668201B2 (en) * | 2003-08-28 | 2010-02-23 | Symbol Technologies, Inc. | Bandwidth management in wireless networks |
US20050135321A1 (en) * | 2003-12-17 | 2005-06-23 | Jacob Sharony | Spatial wireless local area network |
US7164929B2 (en) * | 2004-01-09 | 2007-01-16 | Symbol Technologies, Inc. | Method and apparatus for location tracking in a multi-path environment |
US7319878B2 (en) | 2004-06-18 | 2008-01-15 | Qualcomm Incorporated | Method and apparatus for determining location of a base station using a plurality of mobile stations in a wireless mobile network |
US20060221873A1 (en) * | 2005-03-31 | 2006-10-05 | Jacob Sharony | System and method for wireless multiple access |
US20060221904A1 (en) * | 2005-03-31 | 2006-10-05 | Jacob Sharony | Access point and method for wireless multiple access |
US20060221928A1 (en) * | 2005-03-31 | 2006-10-05 | Jacob Sharony | Wireless device and method for wireless multiple access |
US10195014B2 (en) | 2005-05-20 | 2019-02-05 | Neotract, Inc. | Devices, systems and methods for treating benign prostatic hyperplasia and other conditions |
US8668705B2 (en) | 2005-05-20 | 2014-03-11 | Neotract, Inc. | Latching anchor device |
US10925587B2 (en) | 2005-05-20 | 2021-02-23 | Neotract, Inc. | Anchor delivery system |
US7645286B2 (en) | 2005-05-20 | 2010-01-12 | Neotract, Inc. | Devices, systems and methods for retracting, lifting, compressing, supporting or repositioning tissues or anatomical structures |
US7758594B2 (en) | 2005-05-20 | 2010-07-20 | Neotract, Inc. | Devices, systems and methods for treating benign prostatic hyperplasia and other conditions |
US9549739B2 (en) | 2005-05-20 | 2017-01-24 | Neotract, Inc. | Devices, systems and methods for treating benign prostatic hyperplasia and other conditions |
US8628542B2 (en) | 2005-05-20 | 2014-01-14 | Neotract, Inc. | Median lobe destruction apparatus and method |
US8603106B2 (en) | 2005-05-20 | 2013-12-10 | Neotract, Inc. | Integrated handle assembly for anchor delivery system |
US20070160016A1 (en) * | 2006-01-09 | 2007-07-12 | Amit Jain | System and method for clustering wireless devices in a wireless network |
JP4997637B2 (ja) * | 2007-08-20 | 2012-08-08 | 学校法人慶應義塾 | 位置推定システム及びプログラム |
JP2009281793A (ja) * | 2008-05-20 | 2009-12-03 | Brother Ind Ltd | 移動局測位システム |
US20100113006A1 (en) * | 2008-11-04 | 2010-05-06 | 2Wire, Inc. | Cell calibration |
US9645225B2 (en) | 2008-11-21 | 2017-05-09 | Qualcomm Incorporated | Network-centric determination of node processing delay |
US8892127B2 (en) | 2008-11-21 | 2014-11-18 | Qualcomm Incorporated | Wireless-based positioning adjustments using a motion sensor |
US20100135178A1 (en) * | 2008-11-21 | 2010-06-03 | Qualcomm Incorporated | Wireless position determination using adjusted round trip time measurements |
US9125153B2 (en) | 2008-11-25 | 2015-09-01 | Qualcomm Incorporated | Method and apparatus for two-way ranging |
US8768344B2 (en) | 2008-12-22 | 2014-07-01 | Qualcomm Incorporated | Post-deployment calibration for wireless position determination |
US8033149B2 (en) * | 2009-03-24 | 2011-10-11 | Symbol Technologies, Inc. | Method and system for collecting locationing information in a wireless local area network |
JP2011017684A (ja) * | 2009-07-10 | 2011-01-27 | Kenwood Corp | 測位システム及び制御方法 |
JP2011017685A (ja) * | 2009-07-10 | 2011-01-27 | Kenwood Corp | 測位システム及び制御方法 |
CN101902284B (zh) * | 2010-04-02 | 2012-10-24 | 深圳市普联技术有限公司 | 一种通信参数校准方法和装置 |
US8781492B2 (en) | 2010-04-30 | 2014-07-15 | Qualcomm Incorporated | Device for round trip time measurements |
US8699370B2 (en) * | 2010-08-24 | 2014-04-15 | Euclid, Inc. | Method and apparatus for analysis of user traffic within a predefined area |
US9279878B2 (en) * | 2012-03-27 | 2016-03-08 | Microsoft Technology Licensing, Llc | Locating a mobile device |
US10292801B2 (en) | 2012-03-29 | 2019-05-21 | Neotract, Inc. | System for delivering anchors for treating incontinence |
US10130353B2 (en) | 2012-06-29 | 2018-11-20 | Neotract, Inc. | Flexible system for delivering an anchor |
EP3060935B1 (de) * | 2013-10-25 | 2017-12-20 | Cubic Corporation | Positionierungssystem mit drahtlosen baken mit unterschiedlichen sendeleistungspegeln |
CN105793724A (zh) * | 2013-12-26 | 2016-07-20 | 英特尔Ip公司 | 提高wi-fi技术定位精度的方法和装置 |
JP6335131B2 (ja) * | 2015-03-12 | 2018-05-30 | 富士通フロンテック株式会社 | タグリーダ、タグリーダによる探索方法、タグリーダによる探索プログラム |
JP6664225B2 (ja) | 2016-01-19 | 2020-03-13 | キヤノン株式会社 | 情報処理装置とその制御方法、及びプログラム |
WO2019126718A1 (en) | 2017-12-23 | 2019-06-27 | Neotract, Inc. | Expandable tissue engagement apparatus and method |
US10547978B1 (en) * | 2018-09-04 | 2020-01-28 | Walgreen Co. | Two-way communication system implementing location tracking |
CN109270490A (zh) * | 2018-09-30 | 2019-01-25 | 成都精位科技有限公司 | 定位信号处理方法及装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6014102A (en) * | 1998-04-17 | 2000-01-11 | Motorola, Inc. | Method and apparatus for calibrating location finding equipment within a communication system |
US6240124B1 (en) * | 1995-06-06 | 2001-05-29 | Globalstar L.P. | Closed loop power control for low earth orbit satellite communications system |
US6259912B1 (en) * | 1997-11-20 | 2001-07-10 | Samsung Electronics Co., Ltd. | Apparatus and method for measurement of transmission power of base station and call-test of base station in a digital mobile communication system |
US20030034851A1 (en) * | 2001-08-15 | 2003-02-20 | Norman Robert D. | Systems and methods for self-calibration |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5508708A (en) * | 1995-05-08 | 1996-04-16 | Motorola, Inc. | Method and apparatus for location finding in a CDMA system |
JPH1084571A (ja) * | 1996-09-06 | 1998-03-31 | Star Kikaku Kk | 構内無線通信システム |
US20030146871A1 (en) * | 1998-11-24 | 2003-08-07 | Tracbeam Llc | Wireless location using signal direction and time difference of arrival |
GB2362530B (en) * | 1999-01-08 | 2003-10-08 | Trueposition Inc | Method for improving the wireless location system |
JP2001298769A (ja) * | 2000-04-11 | 2001-10-26 | Sony Corp | 移動体無線通信システム,移動体無線通信方法及び移動局端末 |
JP2001349742A (ja) * | 2000-06-07 | 2001-12-21 | Sharp Corp | 歩行者誘導システム及び方法並びにこれに利用される記憶媒体 |
US6754470B2 (en) * | 2000-09-01 | 2004-06-22 | Telephia, Inc. | System and method for measuring wireless device and network usage and performance metrics |
US6947734B1 (en) * | 2002-12-06 | 2005-09-20 | Sprint Spectrum L.P. | Method and system for location accuracy analysis |
US7162200B2 (en) * | 2003-04-15 | 2007-01-09 | Chung Shan Institute Of Science And Technology | Antenna calibration system and method |
-
2004
- 2004-05-24 US US10/852,348 patent/US7065325B2/en active Active
- 2004-05-24 CN CN200480012342XA patent/CN1830163B/zh active Active
- 2004-05-24 WO PCT/US2004/016161 patent/WO2004106964A2/en active Application Filing
- 2004-05-24 EP EP04753058A patent/EP1683285A2/de not_active Withdrawn
- 2004-05-24 JP JP2006533324A patent/JP4374021B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6240124B1 (en) * | 1995-06-06 | 2001-05-29 | Globalstar L.P. | Closed loop power control for low earth orbit satellite communications system |
US6259912B1 (en) * | 1997-11-20 | 2001-07-10 | Samsung Electronics Co., Ltd. | Apparatus and method for measurement of transmission power of base station and call-test of base station in a digital mobile communication system |
US6014102A (en) * | 1998-04-17 | 2000-01-11 | Motorola, Inc. | Method and apparatus for calibrating location finding equipment within a communication system |
US20030034851A1 (en) * | 2001-08-15 | 2003-02-20 | Norman Robert D. | Systems and methods for self-calibration |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9778372B2 (en) | 2003-06-27 | 2017-10-03 | Qualcomm Incorporated | Wireless network hybrid positioning |
US10895648B2 (en) | 2003-06-27 | 2021-01-19 | Qualcomm Incorporated | Method and apparatus for wireless network hybrid positioning |
US10849092B2 (en) | 2003-06-27 | 2020-11-24 | Qualcomm Incorporated | Local area network assisted positioning |
US10841892B2 (en) | 2003-06-27 | 2020-11-17 | Qualcomm Incorporated | Local area network assisted positioning |
US9810761B2 (en) | 2003-06-27 | 2017-11-07 | Qualcomm Incorporated | Local area network assisted positioning |
US8483717B2 (en) | 2003-06-27 | 2013-07-09 | Qualcomm Incorporated | Local area network assisted positioning |
US9814016B2 (en) | 2003-06-27 | 2017-11-07 | Qualcomm Incorporated | Local area network assisted positioning |
US9749876B2 (en) | 2003-06-27 | 2017-08-29 | Qualcomm Incorporated | Local area network assisted positioning |
JP2011107158A (ja) * | 2004-11-17 | 2011-06-02 | Qualcomm Inc | 位置決定におけるアンビギティーの解決方法 |
US8068802B2 (en) | 2005-03-15 | 2011-11-29 | Polaris Wireless, Inc. | Estimating the location of a wireless terminal based on calibrated signal-strength measurements |
WO2006101675A1 (en) * | 2005-03-15 | 2006-09-28 | Polaris Wireless, Inc. | Estimating the location of a wireless terminal based on calibrated signal-strength measurements |
US7796966B2 (en) | 2005-03-15 | 2010-09-14 | Polaris Wireless, Inc. | Estimating the location of a wireless terminal based on calibrated signal-strength measurements |
US9042917B2 (en) | 2005-11-07 | 2015-05-26 | Qualcomm Incorporated | Positioning for WLANS and other wireless networks |
JP2009515201A (ja) * | 2005-11-07 | 2009-04-09 | クゥアルコム・インコーポレイテッド | Wlan及び他の無線ネットワークの位置測定方法 |
US10568062B2 (en) | 2006-11-04 | 2020-02-18 | Qualcomm Incorporated | Positioning for WLANs and other wireless networks |
CN102577189A (zh) * | 2009-10-12 | 2012-07-11 | 摩托罗拉解决方案公司 | 用于确定无线系统中的节点的范围信息的方法和装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2007500491A (ja) | 2007-01-11 |
WO2004106964A3 (en) | 2006-05-26 |
EP1683285A2 (de) | 2006-07-26 |
JP4374021B2 (ja) | 2009-12-02 |
CN1830163A (zh) | 2006-09-06 |
CN1830163B (zh) | 2011-11-09 |
US7065325B2 (en) | 2006-06-20 |
US20040266465A1 (en) | 2004-12-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7065325B2 (en) | Self calibration of signal strength location system | |
US7474646B2 (en) | Wireless communication system, node position calculation method and node | |
US7236879B2 (en) | Method for calculating the position of a mobile terminal, positioning system, and position calculation apparatus | |
US6968194B2 (en) | Method and system for synchronizing location finding measurements in a wireless local area network | |
US7729707B2 (en) | Method and system for synchronization offset reduction in a TDOA location system | |
EP1742079B1 (de) | System und Verfahren zur Positionsmessung mittels drahtlosem Breitbandsignal (WiBro) | |
Koo et al. | Localizing WiFi access points using signal strength | |
US8786494B2 (en) | Method to modify calibration data used to locate a mobile unit | |
KR100292641B1 (ko) | 가중최소제곱위치해법으로공분산매트릭스추정을행하는방법및장치 | |
US8270994B2 (en) | Applications of signal quality observations | |
WO2020139889A1 (en) | Systems and methods for determining locations of wireless sensor nodes based on anchorless nodes and known environment information | |
EP2368132B1 (de) | Nachrichtengenerierung zur aktualisierung einer referenzdatenbank | |
KR100701351B1 (ko) | 무선 센서 네트워크 기반의 위치인식방법 | |
WO2006101675A1 (en) | Estimating the location of a wireless terminal based on calibrated signal-strength measurements | |
Konings et al. | Do RSSI values reliably map to RSS in a localization system? | |
US20200343980A1 (en) | Data receiver and method of identifying an operational state of a data transmitter by monitoring environment parameters | |
US8639255B2 (en) | Simulation system, simulation apparatus, and simulation method | |
KR20050004297A (ko) | 중계기를 포함하는 무선 네트워크에 대한 신호 경로 검출 | |
WO2020150050A1 (en) | System and method for testing a data packet signal transceiver | |
JP2010130520A (ja) | データベース管理システム、データベース管理方法、受信環境変化検出システム及び受信環境変化検出方法 | |
EP1527650B1 (de) | Anwendungen von signalqualität-beobachtungen | |
WO2000065793A1 (fr) | Instrument de mesure de la qualite d'une ligne | |
CN106664588B (zh) | 用于校准上行链路测量的波束形成的方法和网络节点 | |
Ivanov et al. | Automatic WLAN localization for industrial automation | |
CN102638884B (zh) | 微蜂窝型基站及其信号频率校准方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006533324 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004812342X Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004753058 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2004753058 Country of ref document: EP |